:) and local state, configuration, and anything an app needs when you do stuff. It's really the local user state in most cases, very important to back up!
On my Win10 desktop it got to 30GB though and the stuff worth backup is actually about 1GB of it.
Let's just call it what it is: a complete mess. Some apps install their binaries in there, some just config files, some all your data.
If there are guidelines (and they are not conflicting) about 1/3 of apps are ignoring them.
Also good luck trying to back it up with robocopy or anything, maybe windows' own backup tool can read it while running on that account, I usually get errors, which I think are mostly fine to ignore.
There's no good guideline - if you want a local cache that transports across user migration, that's the show. Windows doesn't really have a "separate your local disk cache from your backups" method, but you can certainly do the Cleanup Task to remove some things that buy into that modal that's 25 years old :)
Let's just call it what it is: a complete mess. Some apps install their binaries in there, some just config files, some all your data.
If there are guidelines (and they are not conflicting) about 1/3 of apps are ignoring them.
Also good luck trying to back it up with robocopy or anything, maybe windows' own backup tool can read it while running on that account, I usually get errors, which I think are mostly fine to ignore.